<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/Welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button @click="showAddCateDialog" type="primary">添加分类</el-button>
        </el-col>
      </el-row>

      <!-- 表格 -->

      <tree-table
        :data="cateList"
        index-text="#"
        border
        show-index
        :columns="columns"
        :expand-type="false"
        :selection-type="false"
        class="treeTable"
      >
        <!-- 是否有效 -->
        <template v-slot:isok="scope">
          <i
            v-if="scope.row.cat_deleted === 'false'"
            class="el-icon-success"
            style="color:lightgreen"
          ></i>
          <i class="el-icon-error" style="color:lightgreen"></i>
        </template>
        <!-- 排序 -->
        <template v-slot:order="scope">
          <el-tag v-if="scope.row.cat_level===0" size="mini">一级</el-tag>
          <el-tag v-else-if="scope.row.cat_level===1" size="mini" type="success">二级</el-tag>
          <el-tag v-else size="mini" type="warning">三级</el-tag>
        </template>
        <!-- 操作 -->
        <template v-slot:opt="scope">
          <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
          <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
        </template>
      </tree-table>

      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>

    <!-- 添加分类对话框 -->
    <el-dialog
      @close="addCateDialogClose"
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
    >
      <!-- 添加分类表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <!-- options用来指定数据源 -->
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChanged"
            clearable
            change-on-select
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 商品数据列表，默认为空
      cateList: [],
      //   查询条件
      queryInfo: {
        tpye: 3,
        pagenum: 1,
        pagesize: 5
      },
      //   父级分类数据
      parentCateList: [],
      addCateForm: {
        //   将要添加的名称
        cat_name: "",
        // 分类ID
        cat_pid: 0,
        // 分类等级默认一级
        cat_level: 0
      },
      // 指定级联
      cascaderProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      // 选中的父级分类id
      selectedKeys: [],
      addCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" }
        ]
      },
      total: 0,
      addCateDialogVisible: false,
      //   为table指定列的定义
      columns: [
        {
          label: "分类名称",
          prop: "cat_name"
        },
        {
          label: "是否有效",
          type: "template",
          template: "isok"
        },
        {
          label: "排序",
          type: "template",
          template: "order"
        },
        {
          label: "操作",
          type: "template",
          template: "opt"
        }
      ]
    };
  },
  methods: {
    //   获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        parms: this.queryInfo
      });
      if (res.meta.status !== 200)
        return this.$message.error("获取分类数据失败");
      this.cateList = res.data;
      console.log(this.cateList);
      this.total = res.data.total;
    },
    // 监听pagesize改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize;
      this.getCateList();
    },
    // 监听pagenum改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage;
      this.getCateList();
    },
    // 点击按钮展示添加分类对话框
    showAddCateDialog() {
      // 先获取父级分类列表
      this.getParentCateList();
      this.addCateDialogVisible = true;
    },
    // 获取父级分类数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        parms: { type: 2 }
      });
      if (res.meta.status !== 200)
        return this.$message.error("获取父级分类数据失败");
      this.parentCateList = res.data;
    },
    // 选择项改变
    parentCateChanged() {
      console.log(this.selectedKeys);
      // 如果selectedkeys》0  选中了父级分类  反之没有
      if (this.selectedKeys.length > 0) {
        // 父级分类id
        this.addCateForm.cat_pid = this.selectedKeys[
          this.selectedKeys.length - 1
        ];
        this.addCateForm.cat_level = this.selectedKeys.length;
        return;
      } else {
        this.addCateForm.cat_pid = 0;
        this.addCateForm.cat_level = 0;
        return;
      }
    },
    // 点击按钮添加新分类
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          "categories",
          this.addCateForm
        );
        if (res.meta.status !== 201) return this.$message.error("添加分类失败");
        this.$message.success("添加分类成功");
        this.getCateList();
        this.addCateDialogVisible = false;
      });
    },
    addCateDialogClose() {
      this.$refs.addCateFormRef.resetFields();
      this.selectedKeys = [];
      this.addCateForm.cat_level = 0;
      this.addCateForm.cat_pid = 0;
    }
  },
  created() {
    this.getCateList();
  }
};
</script>
<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100% !important;
}
</style>